<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

 <head>

  <meta http-equiv="content-type" content="text/html; charset=UTF-8">

  <title>Embedded HTML document for abs-pos-non-replaced-icb-vlr-029 in 'writing-mode: vertical-lr'</title>

  <!--
  position absolute and 'vertical-lr' - 'right' is 'auto', 'left' and 'width' are not 'auto' with 'direction: rtl' in initial containing block
  -->

  <style type="text/css">
  html
    {
      direction: rtl;
    }

  div
    {
      background-color: green;
      border-left: green none 0px;
      border-right: green none 0px;
      height: 100px;
      left: 60%;
      position: absolute;
      right: auto;
      top: 0px;
      width: 20%;
      writing-mode: vertical-lr;
    }

  /*
  "
  6. [If] 'right' is 'auto', 'left' and 'width' are not 'auto', then solve for 'right'
  "
  10.3.7 Absolutely positioned, non-replaced elements
  http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width

  So:

            60% : left
        +
            0px : margin-left
        +
            0px : border-left-width
        +
            0px : padding-left
        +
            20% : width
        +
            0px : padding-right
        +
            0px : border-right-width
        +
            0px : margin-right
        +
           auto : right
        ====================
          500px : width of containing block (width of Initial Containing Block)

  becomes

          300px : left (60% of 500px)
        +
            0px : margin-left
        +
            0px : border-left-width
        +
            0px : padding-left
        +
          100px : width (20% of 500px == 100px)
        +
            0px : padding-right
        +
            0px : border-right-width
        +
            0px : margin-right
        +
          solve : right
        ====================
          500px : width of containing block (width of Initial Containing Block)

   so used right offset value must be 100px .

  */
  </style>
 </head>

 <body>

  <div></div>

 </body>
</html>